Watch 3 planets form triangle in sky

If skies are clear, you'll be able to see Venus, Jupiter and Mercury appear to group together just above the western horizon shortly after sunset on Sunday, May 26th. It is an optical illusion; the planets won't be close. But the grouping -- which will resemble a triangle -- will be distinct, and there won't be anything quite like it again until January 2021. The best time to look is 30-40 minutes after the sun sets. Make sure to give your eyes time to adjust to the night sky before you search the horizon.